Amazon is abandoning a prominent downtown Seattle office project 10 months after it threatened to do so if the city imposed a new business tax.

While the Seattle City Council ultimately reversed itself on the so-called head tax, Amazon confirmed Wednesday it will not occupy the 722,000 square feet of space it had leased in the Rainier Square tower under construction at Fifth Avenue and Union Street. The company did resume construction on another high-rise it had paused as part of last May’s threat.